18301+0404 CHR 72 Aa,Ab

18h 30m 05.12s +04° 03' 55.3" P.A. 285.00 sep 0.1 mag 6.70,9.60 Sp B2V dist. 507.61 pc (1655.82 l.y.)

Coord 2000 18301+0404 Discov num CHR  72 Comp Aa,Ab Coord arcsec 2000 18 30 05.12 +04 03 55.3
Date first 1985 Date last 2021 Obs 17
Pa first 354 Pa last 285.1 P.A. Now (θ) 285.1°
Sep first 0.2 Sep last 0.106 Sep. Now (ρ) 0.106"
Mag pri 6.70 Mag sec 9.60 delta mag (ΔM) 2.9 Spectral class B2V (blue-white)
Pri motion ra +000 Sec motion ra
Pri motion dec -009 Sec motion dec
Notes N O (See Notes, Orbital solution)




This double is physical.



18301+0404 SYSTEM COMPONENTS

Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 123571 18 30 05 +04 03 55 CHR 72 Aa,Ab 2021 17 285 0.1 6.70 9.60 2.90 Y <===
Show HD 170580 123571 18 30 05 +04 03 55 STF 2322 AB 2009 25 172 19.8 6.67 11.28 4.61
Show 123571 18 30 05 +04 03 55 STF 2322 AC 2015 10 295 67.2 6.67 12.79 6.12
Show 123571 18 30 05 +04 03 55 STF 2322 AD 2009 7 197 85.3 6.67 13.39 6.72


Quintuple system
4 estimated visually detectable stars in this system



OTHER CATALOGS AND DESIGNATIONS

Constellation Ophiuchus SAO 123571 HIP 90676 Tycho2 0454-01662-1
Gaia DR2 4284093473916591104 HD 170580 HR 6941 ADS 11399
BD BD+03 3727 FK5 3469 Distance 507.61 Distance ly 1655.82




ORBITAL ELEMENTS

Period (P)70.8y± 8.7 Periastron (T)2008.3y± 2.1 Semi-major axis (a)0.143a± 0.025
Eccentricity (e)0.784± 0.088 Inclination (i)57.7°± 9.2 Longitude of periastron (ω)101.2°± 5.6
Node (Ω)44°± 9.6 Notesn ReferenceTok2021f
Equinox Last observation2021 Grade4(1=Definitive, 9=Indet.)

label theta rho
2000 20.9 0.117
2001 23.6 0.111
2002 26.6 0.104
2003 30.0 0.096
2004 34.2 0.086
2005 39.6 0.074
2006 47.5 0.059
2007 62.4 0.039
2008 118.0 0.017
2009 203.2 0.031
2010 225.4 0.049
2011 236.6 0.062
2012 244.4 0.070
2013 250.8 0.077
2014 256.2 0.082
2015 261.0 0.087
2016 265.4 0.090
2017 269.5 0.094
2018 273.3 0.097
2019 276.9 0.099
2020 280.3 0.102
2021 283.5 0.104
2022 286.6 0.107
2023 289.6 0.109
2024 292.4 0.111
2025 295.2 0.113
2026 297.8 0.115
2027 300.4 0.117
2028 302.9 0.119
2029 305.3 0.121
2030 307.6 0.123


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.



 
 


wds18301%2B0404a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic